import requests

cookies = {
    'X-BackEndCookie': 'S-1-5-21-1234556-56678-12345-2345=alphanumericstring12345/anotheralphanumericstring12345/scsiAdf/P',
    'ClientId': 'LoremIupsum',
    'PrivateComputer': 'true',
    'PBack': '0',
    'cadata': 'bx88rrCBehITlBWSozO2l2hlFGu//JjT1/k6dewX5shV32jANUZSMU6GR+M25B6YpBODEgXzxfIHDnvxNC6SJoaE/d8RWX3uDnbkd+m91jNhMXNSYIRYTJHVFdPG06AE',
    'cadataTTL': 'NfDhBViTJMUdC+ir+6BYvg==',
    'cadataKey': 'qUY+OLTD9V14CFK6/CUPyrJWMxl1FFqZFjB8/qcS0/q55eqGvP9bWvX+XuSYVv3hIGAn9QNPhIDK6NP9LwCBdu25f2BUFDUWJruGO8MW02izSWzRUnni00xWQq3Y3nNKvpvO+OIR641BPHVZ0+lzCw2Wt8uzEnryCWAjlleozF/XWjpTN4/AaTmcIjEZUDN+fo4494rD0mADtEHv2gmd5mhLe+iyii/L9nAB3UuiJomwbRbKgy22Tj8cyavmLC4ZaViqW9E102NOLU4FYLgdZVET+mbdg==',
    'cadataIV': 'bTM88YL1zmz7FsBEB0y3nI2SrdSTy+KLxCpx2FRfIZYFo2spN1IHQMSCT76OXrg79sVPhyqXk+N9rOj6M9KsQl4KqMNVBcoXgp24POpgoTwd4FBmKtAYbd9SDErna3jrMO168ML9PDG18K3CnBf6YG1tsIs0gXOEP9LzHVmUPF7KCKqUFiOiZGWuwmPhl85eo77BbEpVN2JkPnzuQWn6tC0cY4f2cJDlr3Z23SrAUVwwXmgRg2DXfOF5MIEkpwYiiI6sABCD9rsSnE6zTXlvZg33hjiD/ywUV1ZWjI2M/4zBixa4s150+dOnMmvtEFs/nOMnvMJui4PEDlTA==',
    'cadataSig': 'WL3hB+av7sO3bzjL+Efe5b4exnvQxSInH3U5jDvfnPcttSp0XUF3y/NB573C0CTBYuOH/40smFssXlrKhT9tG2ITivdSIIamOmarmC8XwFOv9qQIFMHofcO/jjRDMqF0qRk7WBAC2FgBQrf2Tvq7wk5IX/JHn6zhlgKALAAqH9L9JNC244etnjj9YNaMDYEHV2M2jVTu3FsELqw1rSSqp0hEBlh+aFBvYCBg5hS1mVI76ZCHZVa0OUejiH2yiZyJIKHUI+Sv0rpU3iiQNtIFmGEdwhoo/rga4s4Dc2UsJLQ8c0yGlZgflYs+7Q5gPr74/mTUin60ej/w3M0roUl3FQ==',
    'UC': 'd8be544621964f3c9865b3ee872fd432',
    'AppcacheVer': '15.0.1236.3:en-usbase',
    'X-OWA-CANARY': 'VOXQP6xtGkiNnv7E4rFt8TrmclqVFtQI4IJqZflrR7Wz9AMPkMsFoyAlquw1YGsTUxIkVouAcvk.',
}

headers = {
    'Origin': 'https://nih.mail.edu.fr',
    'Accept-Encoding': 'gzip, deflate, br',
    'X-EWS-TargetVersion': '2.5',
    'Accept-Language': 'en-US,en;q=0.8',
    'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2840.99 Safari/537.36',
    'Action': 'CreateItem',
    'X-Requested-With': 'XMLHttpRequest',
    'Connection': 'keep-alive',
    'X-OWA-CANARY': 'VOXQP6xtGkiNnv7E4rFt8TrmclqVFtQI4IJqZflrR7Wz9AMPkMsFoyAlquw1YGsTUxIkVouAcvk.',
    'X-OWA-ActionName': 'CreateMessageForComposeSend',
    'X-OWA-ActionId': '-37',
    'X-OWA-ServiceUnavailableOnTransientError': 'true',
    'Content-Type': 'application/json; charset=UTF-8',
    'Accept': '*/*',
    'Referer': 'https://localhost/api/',
    'X-OWA-ClientBuildVersion': '15.0.1236.3',
    'X-OWA-CorrelationId': '2f11f8fb-f6c6-43a5-881d-8a1b242a4e70_148023102251337',
    'DNT': '1',
    'X-OWA-ClientBegin': '2016-11-27T07:17:02.513',
    'X-OWA-Attempt': '1',
}

params = (
    ('action', 'CreateItem'),
    ('ID', '-37'),
    ('AC', '1'),
)

data = '{"__type":"CreateItemJsonRequest:#Exchange","Header":{"__type":"JsonRequestHeaders:#Exchange","RequestServerVersion":"Exchange2013","TimeZoneContext":{"__type":"TimeZoneContext:#Exchange","TimeZoneDefinition":{"__type":"TimeZoneDefinitionType:#Exchange","Id":"France Standard Time"}}},"Body":{"__type":"CreateItemRequest:#Exchange","Items":[{"__type":"Message:#Exchange","Subject":"API","Body":{"__type":"BodyContentType:#Exchange","BodyType":"HTML","Value":"<html><head><meta http-equiv=\\"Content-Type\\" content=\\"text/html; charset=UTF-8\\"><style type=\\"text/css\\" style=\\"display:none\\"><!-- p { margin-top: 0px; margin-bottom: 0px; }--></style></head><body dir=\\"ltr\\" style=\\"font-size:12pt;color:#000000;background-color:#FFFFFF;font-family:Calibri,Arial,Helvetica,sans-serif;\\"><p>API Test for NickC<br></p></body></html>"},"Importance":"Normal","From":null,"ToRecipients":[{"Name":"George LUCAS","EmailAddress":"George.LUCAS@nih.mail.edu.fr","RoutingType":"SMTP","MailboxType":"Mailbox","OriginalDisplayName":"George.LUCAS@nih.mail.edu.fr","SipUri":" "}],"CcRecipients":[],"BccRecipients":[],"Sensitivity":"Normal","IsDeliveryReceiptRequested":false,"IsReadReceiptRequested":false}],"ClientSupportsIrm":true,"OutboundCharset":"AutoDetect","MessageDisposition":"SendAndSaveCopy","ComposeOperation":"newMail"}}'

response = requests.post('https://localhost/api/service.svc', headers=headers, params=params, cookies=cookies, data=data)

# Note: original query string below. It seems impossible to parse and
# reproduce query strings 100% accurately so the one below is given
# in case the reproduced version is not "correct".
#response = requests.post('https://localhost/api/service.svc?action=CreateItem&ID=-37&AC=1', headers=headers, cookies=cookies, data=data)
